Servlet Attributes and Parameters

Question:
When a request message is processed through the HttpServlet doGetmethod, who sets the parameters and attributes for theHttpServletRequest argument? And what is the difference between anattribute and a parameter?

Answer:
Client requests are passed on to a servlet through the Web server’sservlet engine. The servlet engine packages the request into aServletRequest object, through which request attributes and parameterscan be extracted.

The HttpServlet class examines the request andrepackages it as an HttpServletRequest before dispatching it to one ofits “do” methods, such as doGet. Attributes provide a means for theWeb server to give a servlet extra information about a request. Theydo not represent data that was sent directly from the client.

Parameters are akin to function arguments. They are name value pairstransmitted by the client and interpreted by the servlet.

Forexample, the values submitted through an HTML form would be passed asparameters that could be accessed through the HttpServletRequestargument to doGet.

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